a chechen rebel leader who's video tamerlan posted online. here the leader threatens death to anyone who helps the infidels. he was killed by the russians last year. and it was on the internet, dzhokhar told fbi agents, that they learned how to make a bomb with a pressure cooker all found from an al qaeda online magazine. >> it suggests people are getting smarter about building easily manufactured bombs and targeting the united states. >> reporter: in russia today, the mother of the brothers tsarnaev, who first encouraged her older son. she was defiant in claiming their innocence. >> my son was muslim! >> reporter: in her first on-camera, interview, she said her sons were being set up. >> what happened is a terrible thing, but i know that my kids have nothing to do with this. i know it, i am mother. >> the parents are talking about coming to boston to see their surviving son and claim the body of the dead one. if the mother comes, she could face arrest for failing to show up in court in boston last year, on charges she shoplifted $1,600 worth